On Fri, Nov 27, 2020 at 11:20 PM Michael Koch <[email protected]> wrote:
> Am 27.11.2020 um 22:47 schrieb Paul B Mahol: > > On Fri, Nov 27, 2020 at 10:40 PM Michael Koch < > [email protected]> > > wrote: > > > >> Am 27.11.2020 um 20:50 schrieb Paul B Mahol: > >>> On Fri, Nov 27, 2020 at 8:24 PM Michael Koch < > >> [email protected]> > >>> wrote: > >>> > >>>> Am 27.11.2020 um 19:25 schrieb Paul B Mahol: > >>>>> On Fri, Nov 27, 2020 at 7:09 PM Michael Koch < > >>>> [email protected]> > >>>>> wrote: > >>>>> > >>>>>> Hello, > >>>>>> > >>>>>> I have a few questions about the asubboost and asupercut filters. > >>>>>> > >>>>>> -- In asubboost it's not yet clear how the block diagram of the > filter > >>>>>> looks like. Especially the "decay" and "feedback" options are > unclear. > >>>>>> What's the input of the the delay line? Before or after the low pass > >>>>>> filter? Where does the feedback go to? Before or after the lowpass > >>>>>> filter? I have attached a sketch of a possible block diagram, but > it's > >>>>>> only a wild guess. > >>>>>> > >>>>> This filter just adds delayed sub frequencies set by cut off > frequency > >>>> back > >>>>> to output. Decay sets decay of old sub echo in buffer and feedback > sets > >>>> how > >>>>> much > >>>>> new sub frequencies are added to the delay buffer. > >>>> Sorry, I didn't understand it. I think this filter could be explained > >>>> much better with a block diagram. > >>>> > >>>> > >>>>>> -- Is it correct that the "slope" parameter effectively changes the > >>>>>> cutoff frequency, but doesn't change the steepness (dB / octave) of > >> the > >>>>>> filter? > >>>>>> > >>>>> It changes steepness, not cutoff. > >>>> What's the unit of the "slope" option? > >>>> > >>>> > >>> 1 / octave, can be set as dB unit, eg. -20dB, 0dB or 1 is max value. > >>> > >>> Use mentioned mpv command for the reason, as it displays curve. > >> The command does not work on my computer. I did download mpv.exe and run > >> the command line. mpv exits immediately, no output, no error message. > >> When I run mpv without any options, then a mpv window opens. > >> > > Make sure you run it inside power shell or cmd.exe and make sure you > tried > > mpv.com too. > > Now with mpv.com it works. But the version doesn't yet have the > asubboost filter. With other filters it works. > Download the latest release version of mpv. Also note that asubbost is not a simple IIR filter and thus it can not really show its response. > Michael > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
